test/compiler/intrinsics/bmi/TestTzcntI.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/**
 * @test
 * @bug 8031321
 * @summary Verify that results of computations are the same w/
 *          and w/o usage of intrinsic
 * @library /testlibrary /testlibrary/whitebox
 * @build TestTzcntI BMITestRunner Expr
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
 *                   -XX:+WhiteBoxAPI TestTzcntI
 */

import sun.hotspot.cpuinfo.CPUInfo;

public class TestTzcntI {

    public static void main(String args[]) throws Throwable {
        if (!CPUInfo.hasFeature("bmi1")) {
            System.out.println("CPU does not support bmi1 feature. " +
                               "Test skipped.");
            return;
        }

        BMITestRunner.runTests(TzcntIExpr.class, args,
                               "-XX:+UseCountTrailingZerosInstruction");
    }

    public static class TzcntIExpr extends Expr.BitCountingIntExpr {

        public int intExpr(int src) {
            return Integer.numberOfTrailingZeros(src);
        }

    }

}